问题

我正在使用DocumentHelper来对节点列表进行排序，使用类似下面的代码，但看起来它是按字母数字顺序排序的。XPath指向一个基于整数的属性。如何调整这段代码以进行基于整数的排序？

private void sortNodesByIndex(Element parent, List<Node> pointList) {
    DocumentHelper.sort(pointList, "@Index", new NumberComparator());
    for (Node node : pointList) {
        parent.remove(node);
        parent.add(node);
    }
}

class NumberComparator implements Comparator<Object> {
    @Override
    public int compare(Object o1, Object o2) {
        if (o1 instanceof Node && o2 instanceof Node) {
            Node node1 = (Node) o1;
            Node node2 = (Node) o2;
            
            // Get the integer values from the nodes' attributes
            int index1 = Integer.parseInt(node1.valueOf("@Index"));
            int index2 = Integer.parseInt(node2.valueOf("@Index"));
            
            // Compare the integer values
            return Integer.compare(index1, index2);
        }
        return 0;
    }
}

请将上述代码添加到您的项目中，并确保导入了相关的类和包。这将使用NumberComparator来执行基于整数的排序。

private void sortNodesByIndex(Element parent, List<Node> pointList) {
        DocumentHelper.sort(pointList, "@Index");
        for (Node node : pointList) {
            parent.remove(node);
            parent.add(node);
        }
    }

答案1

得分: 0

After a lot of messing around I decided to use a custom Comparator. It may not be the best solution but it works!

if (!nodeList.isEmpty()) {
    Collections.sort(nodeList, new SortByIndexComparator());
    Element parent = nodeList.get(0).getParent();
    for (Node node : nodeList) {
        parent.remove(node);
        parent.add(node);
    }
}

class SortByIndexComparator implements Comparator<Node> {
    public int compare(Node a1, Node b1) {
        Element a2 = (Element) a1;
        Element b2 = (Element) b1;
        Integer a = Integer.parseInt(a2.attributeValue("Index"));
        Integer b = Integer.parseInt(b2.attributeValue("Index"));
        return a.compareTo(b);
    }
}

if (!nodeList.isEmpty()) {
                Collections.sort(nodeList, new SortByIndexComparator());
                Element parent = nodeList.get(0).getParent();
                for (Node node : nodeList) {
                    parent.remove(node);
                    parent.add(node);
                }
            }

class SortByIndexComparator implements Comparator<Node> {
        public int compare(Node a1, Node b1) {
            Element a2 = (Element) a1;
            Element b2 = (Element) b1;
            Integer a = Integer.parseInt(a2.attributeValue("Index"));
            Integer b = Integer.parseInt(b2.attributeValue("Index"));
            return a.compareTo(b);
        }
    }